Latent Heat Formula

Latent heat is the heat required to convert a solid into a liquid or vapor phase, or a liquid into a vapor phase. According to the different phases, it has different names like the heat of condensation, the heat of vaporization, etc. The amount of heat energy absorbed or released for a phase change is known as latent heat.

Formula of Latent Heat

The latent heat formula is given by,

L = Q / M

Where,

Q = amount of heat

M = mass of the substance

Solved Examples

Example 1

Determine the latent heat of 5 kg substance if the amount of heat for a phase change is 300 k.cal.

Solution:

Given parameters are,

Q = 300 k.cal

M = 5 kg

The formula for latent heat is given by,

L = Q / M

L = 300 / 5

L = 60 k.cal/kg

Example 2

The heat needed for a phase transfer of 2 kg substance is 400k.cal. Determine its latent heat.

Solution:

Given parameters are,

Q = 400 k.cal

M = 2 kg

The formula for latent heat is given by,

L = Q / M

L = 400 / 2

L = 200 k.cal/kg

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